Check to make sure you haven't retracted it "over itself" versus under. It's a common mistake. While extending, if you keep holding the button, it will actually retract in the reverse direction. Then...when you push "retract" it will extend. If in this reversed position, when you push "extend", it will do nothing as it's trying to retract but it's in the home position. I did this one evening by pushing the wrong button...learned the hard way.
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie